I just installed a hitch on my 2018 Metris. Mercedes dealers wouldn't do it after the original purchase. All aftermarket hitches for the Metris hang lower than the original equipment hitch. This is a big problem if you get a flat and need to access the spare tire underneath the chassis. There is no room to slide the spare out past the aftermarket hitch. You have to jack up the rear end to have the clearance to slide the spare tire out.